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• Scroll Condensing Unit • JEHSCU
19
• Scroll Condensing Unit • JEHSCU
9
Installation & Commissioning
Recommend compressor
w
or
k
ing pressure range
Pressure testing
•
Ma
k
e sure that both service valves are closed
•
When running a pressure test on
f
ield piping, al
w
ays use an inert, dry gas such as Nitrogen
•
The pressure di
ff
erential bet
w
een the high and lo
w
side should not exceed 30 barg (435 psig)
•
Test pressures shall be as sho
w
n
f
ollo
w
s.
•
I
f
there is pressure drop, chec
k
the lea
k
age portion.
Vacuum - moisture removal
Important Note
Moisture prevents proper
f
unctioning o
f
the compressor and the re
f
rigeration system
A
ir and moisture reduce service li
f
e and increase condensing pressure causing abnormally high discharge temperatures li
k
ely to destroy the oil's
lubricating properties. The ris
k
o
f
acid
f
ormation is also increased by air and moisture and copper plating can be generated in this
w
ay.
A
ll these
phenomena can be cause mechanical and electrical
f
ailure.
Important Note
Ensure that a good quality vacuum pump is used to pull a vacuum o
f
0.
67
mbar.abs (-1.0 barg) or less. Ensure that no pressure increase during
1 hour or more a
f
ter stop vacuuming. I
f
pressure increase, there is moisture or lea
k
age along the pipeline.
Co
m
pressor Model
Med Te
m
p
ZB*KQE
Low Te
m
p
ZF*KQE
Med Te
m
p
ZB*KQE
Refri
g
er
a
nt R404A
R404A R134A
Workin
g
Pressure
R
a
n
g
e Hi
g
h
S
ide, (b
a
r
g
)
7.14 -
2
7.6 7.14 -
2
4.6
6.6 -
22
.6
Workin
g
Pressure
R
a
n
g
e Low
S
ide, (b
a
r
g
)
1.98 - 7.14 0.
2
9 - 6.0
0.6 - 3.8
Test pressure
Hi
g
h side
Low side
2
8 b
a
r
g
(405 psi
g
)
19 b
a
r
g
(
2
75 psi
g
)
EE
D
E
N
1
3
-
780A
_
Scro
ll
Condensing
U
nits
- JEH
SC
U.p
d
f 21
30
/
0
4/2
0
1
3
16:11:11